Fire-pot for stoves and furnaces.



J. F. KERNAN & W. J. OWENS. vFIRE POT FOR STOVESND FURNACES. APPLICATLON HLEuoc. s, 1909. RENEwED ocT. 30. |914.

1.140.464. Patented May 25, l1915. il il @Wg-5f@ .FN-2?? +-r\-@ i! I! 5 I .3 i, Il al 'I wml/3558.' 7W? am ff @Wens JOSEPH F. KERAN AND WILLIAM J. OWENS, UTICA, NEW YORK.

FIRE-POT FOR STOVES AND FURNACES.'

Macnee.

Specification of Letters Patent.

rateneeanay e5, reis.

Application led October 6, 1909, Serial No. 521,197. Renewed October 30, 1914; Serial 110.369,437.

'To all Iwhom it may concern ments in Fire-Pots for Stoves and Furnaces,

of which the following is a specification.

This invention relates to lire-pots for stoves and furnaces employing the so called hot blast, or overdraft, in which heatedv air is admitted tothe combustion chamber to promote and increase the combustion, and

has for its particular object to improve the construction and operation and to render the fire-pot stronger and more durable.

The essential features of furnaces of this type consist in providing air passages in or immediately adjacent to the fire-pot in such manner that the air passing there through will become heated to a considerable degree before it is admitted to the combustion chamber above the grate to commingle with and promote the complete combustion of the products. 'Great difficulty, however, has been experienced in the production of a fire-pot provided with air passages arranged efliciently to heat the air without material weakening of the fire-pot and danger of breaking during expansion and contraction. Efficiently to heat the air and deliver it in its properly heated state, various constructions of fire-pots have been proposed with interior or exterior tubular columns, specially arranged and formed and communicating with the combustion chamber through apertures in the iepot wall. rlhese structures have proved impracticable and liable to crack; where the columns have been arl ranged on the exterior of the fire-pot, the fire-pot wall is in direct Contact with the heat of combustion, to expand and contract while theu columns remaining comparatively cool will crack; where on the interior, the columns are in contact with the combustion, but the portion of the fire-pot wall covered by the columns is not in contact, therefore there will be irregular expanding and contracting and danger of breaking.

We believe we have overcome all the objections by the particular structure here shown and our invention has in view to remedy these defects in a mannerl to produce a practicable and durable lire-pot which will accomplish the desired results. These particular features of construction are described and shown in the accompanying drawing in which the reference numerals of the description indicate corresponding parts In the figures A indicates the lire-pot provided with the usual groove 3 on its upper edge to receive the corrugated dome 5 of the combustion chamber having ribs 6, resting thereon.

8 is the casing commonly of galvanized iron, inclosing the usual grates 9, ash pit 10, radiator 1l etc.

Uur improved fire-pot A desirably may be formed substantially cylindrical as shown and made in two sections, lower section 12 being hanged at 13 to accommodate the upper section A14 resting thereon; the sections are provided with the usual radiallydisposed ribs 15, and to supply the desired heated air blast within the combustion chamber 16 are formed air passages 18. In accordance with our invention these passages are arranged on the interiorfbf the fire-pot; the pot for this purpose'is formed integrally to provide on its interior a series of opposing or right and leftribs 20--20 forming the air passages 18 on the inside of the pot and spaced to leave the communieating slots 21 to the combustion chamber through which' the air is supplied. By so forming the air spaces or iues by means of these independent ribs on the interior ofthe lire-pot proper, the heating and distribution of the air is accomplished in an effective manner without'impairing the durability of the pot, as by this arrangement the ribs are free to expand and contract substantially independent of the {ire-pot wall and all parts of the fire-pot wall are heated with substantial equality, so that expansion and contraction thereof is substantially uniform.

As shown the ribs may be inclined and curved in form providing an air passage or flue wider at the bottom than at the top to prevent their becoming clogged up with ashes and clinkers the ashesbeing permitted to drop freely into the ash pit. Ribs may be provided to form any number of ai pas;

sages and spaced to provide any size of slot desired, a desirable arrangement being Q j l1,140,4.64

, this type of furnace in a manner contribut` ing to the etliciency of the air supply, while in no way impair-ing or weakening the firepot, uniform expansion and contraction bcing permitted at all times.

Having thus described our what we claim is:

1. A {ire-pot having a wall of substantially uniform thickness and extending in a' invention,

substantially uniform curve throughout itsentire periphery, and having small, integral, supplementary, curved ribs inwardly projecting from its interior surface and re versely arranged with their edges adjacent and suitably spaced to form air passages within the ribs and longitudinal 'slots from the air passages to the combustion chamber, said air passages being larger at the bottom and gradually diminishing toward the top,

. substantially as described and shown.

2. A sectional fire pot composed of circular sections each having a wall of substantially uniform thickness and having small integral, supplementary, curved ribs inwardly projecting from its interior surface and reversely arranged with their edges ad* jacent and suitably spaced to form air passages within the ribs and longitudinal slots from the air passages to the combustion chamber, said air passages being larger at the bottom and gradually diminishing toward the top and the vair passages of the lower section communicating with the upper section to form continuous passages, substantially as described.

3. A fire-pot having a wall of substantially uniform thickness and extending in a substantially uniform curve throughout its entire periphery, and having small, supple mentary, curved ribs inwardly projecting from its interior surface and reversely arranged with their edges adjacent and suitably spaced to form air passages Within the ribs and longitudinal slots from theair pas-l sages to the combustion chamber, said air passages being larger at the bottom and gradually diminishing toward the top, substantially as described and shown.

4. A sectional lire-pot composed of circular sections each having a wall of substantially uniform thickness and having small, supplementary, curved ribs inwardly projecting from-its interior surface and reversely arranged with their edges adjacent and suitably spaced to form -air passages within the ribs and longitudinal slots from the air passages to the combustion chamber, said air passagesbeing larger at the bottom and gradually diminishing toward the top and the air passages of the lower section communicating with the upper section to form continuous passages, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOSEPH F. KERNAN. WILLIAM J. OWENS.

Witnesses:

JOHN EDWARD LEWIS, IRVING FRANCIS WALTER. 

